Apps like Transparent Pie/Oreo/Oxygen -

Here are some great alternatives to Transparent Pie/Oreo/Oxygen - by Gianluca Spadazzi :
BigBlu Substratum Theme
BigBlu Substratum Theme
★4.8
Onyx Substratum Theme
Onyx Substratum Theme
★4.6
RubiQ Substratum Theme
RubiQ Substratum Theme
★4.3
Alined Substratum Theme
Alined Substratum Theme
★4.5
Aurora - Substratum Theme
Aurora - Substratum Theme
★4.8
Victory Substratum Theme +Oreo
Victory Substratum Theme +Oreo
★4.6
Translucent Substratum Theme
Translucent Substratum Theme
★4.8
Iris Monet (F) - Substratum
Iris Monet (F) - Substratum
★4.8
Flux - Substratum Theme
Flux - Substratum Theme
★4.4
Iris Monet [Substratum]
Iris Monet [Substratum]
★4.8
Antares [Substratum]
Antares [Substratum]
★4.5
Pixel Theme - Substratum
Pixel Theme - Substratum
★3.8
Iris - Substratum Theme
Iris - Substratum Theme
★4.8
Project Themer · Android 12/13
Project Themer · Android 12/13
★4.0
EasterEggCollection in Android
EasterEggCollection in Android
★4.2
Antares CM13 / 12 Theme
Antares CM13 / 12 Theme
★4.7